alternatehistory.com


https://www.slideshare.net/mico69/butterfly-stroke

So, the arms going above the water during the recovery phase was an innovation for the breaststroke. And about 20 years later, butterfly was introduced as a separate event in the Olympics in 1956.

Are there other examples in which both the 'old' and 'new' styles are kept, but as separate events?
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